#!/usr/bin/lua

require("aports")
require("lfs")

local db

-- subcommands -----------------------
subcmd = {}
subcmd.revdep = {
	desc = "Print reverse dependencies",
	usage = "PKG...",
	run = function(opts)
		local i
		for i = 2, #opts do
			db:foreach_revdep(opts[i], function (k,p)
				print(p.pkgname)
			end)
		end
	end
}

subcmd.list = {
	desc = "Print all packages built from aports tree",
	usage = "",
	run = function()
		db:foreach(function (k)
			print(k)
		end)
	end
}

subcmd.recursdeps = {
	desc = "Recursively print all make dependencies for given packages",
	usage = "PKG...",
	run = function (opts)
		for i = 2, #opts do
			db:recurs_until(opts[i], function(pn)
				print(pn)
			end)
		end
	end
}

subcmd.builddirs = {
	desc = "Print the build dirs for given packages in build order",
	usage = "PKG...",
	run = function(opts)
		local i, p, _
		local visited = {}
		local to_print = {}
		for i = 2, #opts do
			db:foreach_pkg(opts[i], function(_, p)
				to_print[p.dir] = true
			end)
		end
		for i = 2, #opts do
			db:recurs_until(opts[i], function(pn)
				local j,p
				db:foreach_pkg(pn, function(j, p)
					if to_print[p.dir] then
						print(p.dir)
						to_print[p.dir] = nil
					end
				end)	
			end)
		end
	end
}


function print_usage()
	io.write("usage: ap -d <DIR> SUBCOMMAND [options]\n\nSubcommands are:\n")
	local k,v
	for k in pairs(subcmd) do
		print("  "..k)
	end
end

-- those should be read from some config file
repodirs = {} 


-- parse args
i = 1
opts = {}
help = false
while i <= #arg do
	if arg[i] == "-d" then
		i = i + 1
		repodirs[#repodirs + 1] = arg[i]
	elseif arg[i] == "-h" then
		help = true
	else
		opts[#opts + 1] = arg[i]
	end
	i = i + 1
end


cmd = opts[1]

if cmd == nil then
	print_usage()
	-- usage
	return
end

if #repodirs == 0 then
	if lfs.attributes("APKBUILD") then
		repodirs[1] = string.gsub(lfs.currentdir(), "(.*)/.*", "%1")
	else
		repodirs[1] = lfs.currentdir()
	end
end

if subcmd[cmd] and type(subcmd[cmd].run) == "function" then
	db = aports.new(repodirs)
	subcmd[cmd].run(opts)
else
	io.stderr:write(cmd..": invalid subcommand\n")
end